Thermal stress reduces pocilloporid coral resilience to ocean acidification by impairing control over calcifying fluid chemistry

International audience The combination of thermal stress and ocean acidification (OA) can more negatively affect coral calcification than an individual stressors, but the mechanism behind this interaction is unknown. We used two independent methods (microelectrode and boron geochemistry) to measure...

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Bibliographic Details
Published in:Science Advances
Main Authors: Guillermic, Maxence, Cameron, Louise, De Corte, Ilian, Misra, Sambuddha, Bijma, Jelle, De Beer, Dirk, Reymond, Claire, Westphal, Hildegard, Ries, Justin, Eagle, Robert
Other Authors: Laboratoire Géosciences Océan (LGO), Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne), Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Interdisciplinary Graduate School for the Blue planet, ANR-17-EURE-0015,ISBlue,Interdisciplinary Graduate School for the Blue planet(2017)
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2021
Subjects:
[SDE]Environmental Sciences
Ocean acidification
Online Access:https://hal.univ-brest.fr/hal-03154497
https://hal.univ-brest.fr/hal-03154497/document
https://hal.univ-brest.fr/hal-03154497/file/eaba9958.full.pdf
https://doi.org/10.1126/sciadv.aba9958
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Summary:International audience The combination of thermal stress and ocean acidification (OA) can more negatively affect coral calcification than an individual stressors, but the mechanism behind this interaction is unknown. We used two independent methods (microelectrode and boron geochemistry) to measure calcifying fluid pH (pHcf) and carbonate chemistry of the corals Pocillopora damicornis and Stylophora pistillata grown under various temperature and pCO2conditions. Although these approaches demonstrate that they record pHcf over different time scales, they reveal that both species can cope with OA under optimal temperatures (28°C) by elevating pHcf and aragonite saturation state (ωcf) in support of calcification. At 31°C, neither species elevated these parameters as they did at 28°C and, likewise, could not maintain substantially positive calcification rates under any pH treatment. These results reveal a previously uncharacterized influence of temperature on coral pHcf regulation-the apparent mechanism behind the negative interaction between thermal stress and OA on coral calcification.

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